2-Points creation Two points, representing centers of semicircles,
must be created. Click on
and . Enter coordinates for
first point : for example 0. (enter), 0. (enter) and 0. (enter). Then validate
with the mouse. Enter coordinates for second point : for example 0. (enter),
10. (enter) and 0. (enter) and validate with the mouse.

Come back to the main menu and close all menus opened.

Note :
- Coordinates are real numbers that's why it is important to put a point
after the number of the coordinate (or write it with its first decimal,
2.0 for example) when it is an integer and especially if you want to use
Fluent by the way.
- Lengths must be exprimed in meters.

3- Semicylinder creation

Icem possesses an especially menu to create surface
of revolution :

Click on
and . Choose 1-Axis then
2-Between
two points and select the two points with the mouse. After, enter the
radius of the semicylinder, for example 4.0 meters. (enter), the starting
angle 0.0. (enter) and the ending angle 180.0. (enter). Then validate with
the mouse.

Come back to the main menu and close menu opened.
The following geometry appears when you change the angle view using mouse
:

Note : You can see and move the representation
of the semicylinder by selecting ,
and using the mouse to translate, to zoom .... When you want to come back
to the DDN creation , click again on
( this icon allows to change the the dynamic mode )

4- Isoparametric curves creation

Now, we must create a B-spline curve on each
extremity of the semicylinder in order to create the two normal surfaces
:
Select
and . Select the semicylinder
with the mouse and choose 2-All edges. All the edges of the semicylinder
become in orange color.

Come back to the main menu and
close menus opened.

5- Points and lines creation Points and lines making up surfaces around the semicylinder
must be done. Click on ,
and select each side of the two vertical line of the semicylinder to make
appear the four points of the semicylinder.
Then click on ,
and select the two upper points to create the first line and then the two
lower points to create the second line.

Come back to the main menu and close menus opened.

6- Backgroung surface creation

Click on ,
and . For the background
surface of the semicylinder select the four curves delimitate by the four
points with the mouse and validate.

Come back to the main menu and close menus opened.

WARNING: You must
select curves in a rotative sense.

7-Conversion of the two circles in B-spline Now, the two semicircles of the semicylinder must
be converted in B-spline by clicking on ,
and on the of .
Select one of the circles and validate with the mouse. Choose 1-entire
surface and 1-Tolerance, enter 0.001 (enter).

Come back to the main menu and close menus opened.

Proceed to the same operation for the other semicircle
and come back again to the main menu.

8- Surfaces creation

Note :Before creating these surfaces
you need to hide some surfaces. Click on
and in the blank part. Select
the surface you want hidden (lateral surface and background surface
of the semicylinder) and validate. You can refresh the scheme

Now we are going to divide each circle curves into
3 parts. This operation is necessary because we need four edges to create
surface. Click on ,
and . Select one of the curves
and choose 4-Divide into N segments, enter the number of segments
you want, here 3 (enter) and select 2-Delete. Redo the same operation
for the second semicircle curve.

Come back to the main menu and close menus opened.

We are going now to create surfaces as in section
5. For each surface we want create (each extremity) select the four curves
bordering the semidisc in a rotative sense with the mouse and validate.
Surfaces are created.

Come back to the main menu and close opened menus.

9- Interior point creation

You need a point inside the domain in order to situate
the interior (where the grid will be situated). Create this point (for
example 0. 5. 2.) like you have already done in section 1 and come back
to the main menu.

The geometry with DDN is now terminated.

10-Save the geometry The save is automatically by clicking on
and Quit in .

Creation of the families and the reference size cells

Now we are going to create families with DDN-tetin
: in "DDN tools" in the upper menu, select "DDN->tetin" to enter in DDN->tetin
and select your geometry file.

1- Change of the reference cell

The size of the reference cell must be changed. Select
1-modals,
1-reference
element size and enter 0.5 for example (enter).

Note :
-You can choose others name for all families except FLUID family which
is a name you must choose for the interior domain (also, you can choose
LIVE).
- The family SYM is a symetry family but you can change it if you want.

3-Elements Selection

Choose 7-Entity-add and for each family (inlet,
outlet, wall, sym) select the adequate surface with the mouse and validate
twice.

Note : - You can see the geometry by clicking on
, so you are now in DDN and you can topple over in DDN->tetin by clicking
on ,
and .
- All surfaces must be here B-splines. If it is
not the case answer "y" for yes when the question "Convert in B-spline
the curve selected?" appears.

Come back to the main menu in DDN->tetin.

4- Material domain creation

Now choose 3-Domains, 1-Create material
domain and the family Fluid corresponding to the interior of the geometry,
here fluid. Select the interior point with the mouse, validate and enter
the size of cells you want inside the geometry, for example 0.5 (enter).

Come back to the main menu.

5-Save the project

You can quit and save by choosing 10-File/Exit and 2-File.

Creation of the grid

We can now proceed to the grid. We have choose to
study the tetrahedra mesher.

1-Choose your file.

2-Choose "Meshing" in the upper menu, "Tetra" and "Batch from CAD".

3-Click on "Load Cut Domain" and unselect "Run Smoother" (we are going
to see what the Smoother is in a next part). Click on Accept.

The grid is now ready.

Boundary conditions and save the grid

We must now create the file which can be readen by
a solver for example FLUENT 5.

2- Click on "Bound conds" and put the rigth boundary conditions to the
different families with "New b.c.": INLET->velicity-inlet,
OUTLET->pressure-outlet, WALL->wall, SYM->symetry.

3-Click on "Fluent_V5 input". You can save the current projet if you
want. In "Domain selection", select "Cut domain1". ICEM create a fluent.msh
file in the repertory ./transfer.This file can be opened with Fluent 5.